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Actually no. Batteries and thier inverter adapt in the about one second to half a second range. The massive inertia of a turbine adapts in the millisecond range.
To maintain 60 hz you need to be in the very low milliseconds range. Remember at 60 hz you do a full sin wave cycle in 16ms.
Turbines act as a tremendous power smoother in the grid.
You say it’s a non-representative performance for Biden but that’s not really true. Biden has not been doing many interviews. He does prescripted events where he can use a teleprompter.
You have to go back to Regan to get fewer press conferences. He even skipped the traditional superbowl interview that is a notorious softball.
This all suggests that his team knows he can’t handle an interview and are avoiding it. If they thought he could handle it with his polling they would have him doing them all the time.
After the debate performance he needs to do something to show he can string some thoughts together in a coherent way. I think this Fridays interview is a desperate last shot to do that.